/Engine/Source/Runtime/CoreUObject/Public/Serialization/AsyncPackageLoader.h
Asynchronously load a package.
Unique ID associated with this load request (the same package can be associated with multiple IDs).
int32 LoadPackage ( const [FPackagePath](API\Runtime\CoreUObject\Misc\FPackagePath) & PackagePath, [FName](API\Runtime\Core\UObject\FName) CustomPackageName, FLoadPackageAsyncDelegate InCompletionDelegate, EPackageFlags InPackageFlags, int32 InPIEInstanceID, int32 InPackagePriority, const [FLinkerInstancingContext](API\Runtime\CoreUObject\UObject\FLinkerInstancingContext) * InInstancingContext, uint32 InLoadFlags )